I'm upgrading my old but very reliable Denon AV Amp. (Ten years of use and never a problem).The options I'm thinking about are the Denon AVR-2805 or the Yamaha RX-V1400RDS. I am of course willing to consider others. (I'm happy to spend up to £600). Any comments would be really helpful. I have a Mordaunt Short Avant 5.1 speaker system, which I've just purchased, to power. My room is only 7m x 4m.